<table #myTable>
  <thead>
  <tr>
    <th *ngFor="let item of column" [style]="{'width': item.width + 'px'}">
      {{item.title}}
      <div class="line" (mousedown)="move(item, $event)"><div class="line-box"></div></div>
    </th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <td>数据1</td>
    <td>数据2</td>
    <td>数据3</td>
  </tr>
  </tbody>
</table>
